public class Test {
    public static void main(String[] args) {

//        int a = 10;
//        char b = '中';
//        double c = 3.14;
//        long d = 100_0000_0000L;

        double a = 1;
        double b = 2;
        System.out.println(a / b);

        String c = "10";
        int d = Integer.parseInt(c);
        double e = Double.parseDouble(c);
        long f = Long.parseLong(c);

        System.out.println(d);
        System.out.println(e);
        System.out.println(f);

    }
}
